Paving the way for 'uncrackable' codes

    Date06 Nov 2003
    CategoryCryptography
    3541
    Posted ByAnthony Pell
    The heart of a new light-emitting diode (LED) developed in Cambridge, UK, can be controlled so precisely that it emits just one single photon of light each time it is switched on. The device could be a key component in quantum . . . The heart of a new light-emitting diode (LED) developed in Cambridge, UK, can be controlled so precisely that it emits just one single photon of light each time it is switched on. The device could be a key component in quantum cryptography, a code-making technology which, it is hoped, will be uncrackable. The ability to send single packets of light already exists but this is the first time a device has been built without using lasers.

    Its designers say they are optimistic that the device could be produced cheaply and quickly in industrial quantities.

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